In the circuit diagram what does the symbol made of two long lines into short lines with a positive and negative sign in each and represent

sorry i tried to but i didn’t get it

the answer is b hope that

the correct answer is a) egypt and china.

egypt and china are two of the world’s oldest civilizations known by man. both ancient empires have left a great historic and cultural legacy to the world through archeology. both civilzations developed complex social relations, had deep religious beliefs, had dominion of agriculture and left writing records to understand their customs and culture.

among the requirements to consider a civilization, we find urbanization, writing records, a place of residence, agriculture methods, technological specialization, means of transportation, currency, population density, social stratification, and political integration.

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.